Am 04.02.2016 um 12:49 schrieb Filippo Stefanelli via DCPomatic:

Thanks Игорь but no, we got the same error also when we sent the DCP with an external drive (we have done this two times...).

Try to delete the whole project folder content (except Metadata.xml - and of course, in case, except your source files, should they be in the same folder), that is, clean up your project directory. Then recreate a short passage of the project and try again.